CENTRAL PARK ROAD AND RIVERLAND DRIVE INTERSECTION

IMPROVEMENTS PROJECT

Project Manager: Devri DeToma, P.E.

PURPOSE

To improve safety and traffic flow for all modes of transportation at

the intersection of Central Park Road and Riverland Drive while

minimizing impacts to grand trees.

The South Carolina Department of Transportation (SCDOT) deemed

this intersection a high priority due to the 23 crashes and 1 fatality

in a 3-year period.

COMMENT FORM

Comment Forms are available

at Sign-In Table and online at

https://roads.charlestoncoun

ty.org/projects/james-

island/centralpark.php

Comments Must be Submitted

by March 20, 2019

EVALUATION OF ALTERNATIVES

The Transportation Development Department studied 8 alternatives. The project team eliminated 5

alternatives that either failed to improve traffic flow or

impacted more than 10 grand trees.

Staff held a Public Meeting on October 24, 2018 to present the

3 reasonable alternatives and to receive the public’s

feed back.

The Purpose of this Public Comment Meeting is to gather comments on Alternatives 1 & 3 and to discuss

recommendations moving forward.

ALTERNATIVE 1 – Signalized Intersection

Right of WayImpacts

0.77 Acres

Grand Tree Impacts* 10 (10)

2040 Peak Hours AM School PM

Level of Service B B B

*The first number represents the total number of grand trees impacted and the number in parenthesis indicates how many of those are Grand Oaks.

ALTERNATIVE 1 – Signalized Intersection

ALTERNATIVE 3 – Elongated Roundabout (RAB)

Right of WayImpacts

2.16 Acres

Grand Tree Impacts* 7 (3)

2040 Peak Hours AM School PM

Level of Service C B B

*The first number represents the total number of grand trees impacted and the number in parenthesis indicates how many of those are Grand Oaks.

ALTERNATIVE 3 – Elongated Roundabout (RAB)

SAFER ALTERNATIVE

Alternative 1 Signalized Intersection

Alternative 3Elongated Roundabout (RAB)

Has a Crash Reduction Factor

(CRF) of 46% for all Crashes

Has a Crash Reduction Factor

(CRF) of 72% for all Crashes

Has a CRF of 54% for

Crashes with Injuries

Has a CRF of 88% for

Crashes with Injuries

Safer Design

CRF is obtained from Federal Highway Administration Crash Modification Clearinghouse www.cmfclearinghouse.com Specific CMF ID’s: 206, 210, 7966, 7969.

SAFETY FEATURES

Alternative 1 Signalized Intersection

Alternative 3Elongated Roundabout (RAB)

Higher Speeds/Relies on Driver Obedience

Slower Speeds/ Physical Separation

Reduces Overall Crashes, particularly

Angle Crashes

Potential for Right Angle and Head-On

Crashes is Eliminated

May increase rear-end crashes

May increasesideswipe Crashes

Pedestrians will Cross at Signal

Pedestrians will have a refuge

across Riverland Dr

Safer Alternative

ADVANCING DESIGN

Alternative 1 Signalized Intersection

Alternative 3Elongated Roundabout (RAB)

• Determine Construction Limits

• Review Drainage

• Identify Signal Pole Locations

• Coordinate with Utilities –5 or more Overhead Utility Poles

• Refine Shared Use Path Design

• Refine Right of Way Needed

• Coordination with SCDOT

• Determine Construction Limits

• Minimize Median/Impacts

• Review Drainage

• Coordinate with Utilities -3 or more Overhead Utility Poles

• Refine Shared Use Path Design

• Refine Right of Way Needed

• Coordinate with SCDOT

PATH FORWARD

• Review Public Meeting Feedback

• Staff Recommendation

Advance Design for Alternatives 1 and 3 to 30% Plans in an effort to reduce unknowns and refine right of way needs

Thank You